Server-to-browser push via SignalR. Modules raise events marked with [BroadcastEvent] (or call IBroadcaster directly); the framework forwards them to subscribed clients. See docs/broadcasting.md for the full developer guide.

• IBroadcastEvent / BroadcastEventAttribute — opt-in marker
• IBroadcaster — fan-out service (channel / user / tenant)
• IBroadcastChannelAuthorizer — per-prefix subscription guards
• BroadcastChannels — naming helpers (private-users.{id}, presence-...)
• BroadcastContext — ClaimsPrincipal + tenant id passed to authorizers
• BroadcastEnvelope, PresenceChange, PresenceMember — wire payloads

The SignalR hub, broadcaster implementation, authorizer chain, and Wolverine bridge live in SimpleModule.Hosting/Broadcasting/.